[es6] Map/Set size getter should have "get size" name

test/mjsunit/es6/collections.js

Index: test/mjsunit/es6/collections.js
diff --git a/test/mjsunit/es6/collections.js b/test/mjsunit/es6/collections.js
index e1e7758b1a89e616e47c89483f1a56cd0979b677..e410e2259c8624b460a9f9874ea692def675b45c 100644
--- a/test/mjsunit/es6/collections.js
+++ b/test/mjsunit/es6/collections.js
@@ -443,6 +443,7 @@ assertTrue(setSizeDescriptor.get instanceof Function);
 assertEquals(undefined, setSizeDescriptor.get.prototype);
 assertFalse(setSizeDescriptor.enumerable);
 assertTrue(setSizeDescriptor.configurable);
+assertEquals('get size', setSizeDescriptor.get.name);
 
 var s = new Set();
 assertFalse(s.hasOwnProperty('size'));
@@ -463,6 +464,7 @@ assertTrue(mapSizeDescriptor.get instanceof Function);
 assertEquals(undefined, mapSizeDescriptor.get.prototype);
 assertFalse(mapSizeDescriptor.enumerable);
 assertTrue(mapSizeDescriptor.configurable);
+assertEquals('get size', mapSizeDescriptor.get.name);
 
 var m = new Map();
 assertFalse(m.hasOwnProperty('size'));